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    <title>计算器</title>
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    <a href="https://github.com/52js/calc/blob/master/README.md"
      ><h1>计算器（点我查看使用说明）</h1></a
    >
    <div class="content">
      <div class="input" contenteditable="true"><br /></div>
      <div class="btns">
        <button id="calculate" class="btn-donate">计算</button>
        <button id="copyEvery" class="btn-donate">复制算式和答案</button>
        <button id="copyResult" class="btn-donate">复制答案</button>
        <button id="clear" class="btn-donate">清空</button>
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        Copyright © 2023 52js, 川少. All rights reserved.
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